title: Protein synthesis stimulated in sonicated sugar beet cells and protoplasts.
abstract: Sugar beet suspension cells and protoplasts were exposed to 20 kHz ultrasound and the amount of 35S-methionine incorporated into cellular protein was determined after 2 days of culture. The incorporation of 35S-methionine in cells was enhanced up to 90% after sonication for 220-770 ms at 1.2-3.5 W/cm2 which reduced viability 5-11% and decreased the average size of cell aggregates. In protoplasts, the 35S-methionine incorporation was increased up to 31% after sonication for 220-550 ms at 0.3-1.0 W/cm2 with a concomitant reduction in viability of 10-16%. At higher ultrasonic energies, 35S-methionine incorporation declined proportionally to the reduction in protoplast viability. At concentrations up to 30 mM, cystamine and cysteamine did not affect 35S-methionine incorporation or viability of the sonicated protoplasts. These results show that mild ultrasonic irradiation can stimulate protein synthesis in plant cells and protoplasts significantly.
authors.affiliation: DANISCO A/S, Biotechnology Research Division, Copenhagen, Denmark.
authors.forename: M
authors.initials: M
authors.lastname: Joersbo
authors.forename: J
authors.initials: J
authors.lastname: Brunstedt
mesh_terms: D059828:Plant Cells; D010940:Plant Proteins / Q000096:biosynthesis*; D011523:Protoplasts / Q000378:metabolism; D014465:Ultrasonics
chemical_list: D010940:Plant Proteins